﻿using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Net;
using System.Runtime.InteropServices;

namespace FileDownloader
{
    

    public partial class Browser : Form
    {
        private Form1 mOwner;
        private WebProxy mProxy;

        public Browser(Form1 owner, WebProxy proxy)
        {
            InitializeComponent();

            mOwner = owner;
            mProxy = proxy;
        }

        private void openToolStrip_Click(object sender, EventArgs e)
        {
            try
            {
                if (mProxy != null)
                {
                    WebRequest.DefaultWebProxy = mProxy;
                }
                string cookie = "";
                if (Form1.FileRequest.IsIeeeUrl(urlToolStrip.Text))
                {
                    cookie = "Set-Cookie: WLSESSION=1579311756.20480.0000 domain=ieeexplore.ieee.org";
                }
                webBrowser1.Navigate(new Uri(urlToolStrip.Text),"", null, cookie);
            }
            catch (UriFormatException)
            {
                MessageBox.Show(this, "Invalid address!", "Warning", MessageBoxButtons.OK, MessageBoxIcon.Exclamation, MessageBoxDefaultButton.Button1);
                urlToolStrip.Focus();
            }
            catch (Exception exception)
            {
                MessageBox.Show(this, exception.Message, "Warning", MessageBoxButtons.OK, MessageBoxIcon.Exclamation, MessageBoxDefaultButton.Button1);
            }
        }

        public struct Struct_INTERNET_PROXY_INFO
        {
            public int dwAccessType;
            public IntPtr proxy;
            public IntPtr proxyBypass;
        };

        [DllImport("wininet.dll", SetLastError = true)]
        private static extern bool InternetSetOption(IntPtr hInternet, int dwOption, IntPtr lpBuffer, int lpdwBufferLength);

        private void RefreshIESettings(string strProxy)
        {
            const int INTERNET_OPTION_PROXY = 38;
            const int INTERNET_OPEN_TYPE_PROXY = 3;

            Struct_INTERNET_PROXY_INFO struct_IPI;

            // Filling in structure
            struct_IPI.dwAccessType = INTERNET_OPEN_TYPE_PROXY;
            struct_IPI.proxy = Marshal.StringToHGlobalAnsi(strProxy);
            struct_IPI.proxyBypass = Marshal.StringToHGlobalAnsi("local");

            // Allocating memory
            IntPtr intptrStruct = Marshal.AllocCoTaskMem(Marshal.SizeOf(struct_IPI));

            // Converting structure to IntPtr
            Marshal.StructureToPtr(struct_IPI, intptrStruct, true);

            bool iReturn = InternetSetOption(IntPtr.Zero, INTERNET_OPTION_PROXY, intptrStruct, Marshal.SizeOf(struct_IPI));
        }
    }
}